Open-Plan Conversions Soho
Open-plan kitchen, diner and living conversions in Soho, steel, floors, heating and finishes as one job.
- Rated 4.9 from 31 reviews on MyBuilder
- London guide: £3,000 to £8,000+
- Free site survey, itemised quote
GS Renovation creates open-plan living across Soho and W1, from knock-throughs and kitchen-diners to broken-plan layouts and Crittall dividers. In the area's characterful period buildings and upper-floor apartments, we open up tight period rooms into bright, connected spaces, with our founder's 30+ years of structural experience behind every conversion in Westminster.
In Soho, a knock-through finished as one room typically costs £3,000 to £8,000 or more, including the steel beam (indicative London ranges, MyBuilder and Checkatrade, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Soho: the structural engineer we appoint designs the steel, we install it, and building control signs it off.
Price guide
| Work | Indicative London range |
|---|---|
| Open-plan conversion, steel beam and finishing | £3,000 to £8,000+ |
Indicative London ranges (MyBuilder and Checkatrade, 2026), not a quotation. Prices checked September 2026. Full breakdown: Open-Plan Kitchen-Diner Ideas.
How the job runs
- Free site survey at your Soho address, covering the walls, services and floor levels, and an itemised quote.
- The engineer we appoint sizes the beam, and the work is registered with Westminster City Council building control or an approved inspector. On a shared wall you serve the party wall notice as building owner; we supply the drawings.
- Props in, opening cut, beam on padstones; then floors, heating and electrics are joined up.
- Building control inspects the steel before it is covered. We finish the room, and the completion certificate follows.
Open-plan living in Soho's period flats
The period buildings around Soho were laid out as small, separate rooms, and the upper-floor flats made from them often keep that cramped plan, so opening them up changes how a home lives. A classic knock-through joins the front room to the back, a kitchen-diner joins the kitchen to the living room, and a broken-plan scheme uses a part-height wall or a Crittall-style glazed divider to keep zones without losing the light. Each layout starts from what the existing structure allows.
The wall between those period rooms is usually load-bearing, so we do not simply knock it out. The structural engineer we appoint sizes a steel beam to carry the floors above, and it bears onto padstones set into solid masonry at each end. We prop the opening, remove the wall in stages and drop the steel in before the props come out. Crittall dividers and glazed screens are then fitted into the finished, supported opening for that broken-plan feel.
Housing in Soho
About 6,840 homes are listed for the Fitzrovia West & Soho statistical area, and the mix is 2% houses to 98% flats, with 47% built after 1945, 5% in 1919 to 1939 and 48% earlier. Since most homes here are flats, opening up a flat in Soho changes the protected route from the bedrooms to the front door, so building control checks the escape before any wall comes out.
Open-plan Soho flats and the paperwork that closes them out
An open-plan conversion changes the layout of the flat by definition, and Westminster keeps the building notice route for work that leaves the layout as it was. So in Soho an open-plan scheme goes to building control as full plans, with the floor plan showing how the flat's front door, the shared stair and any linked smoke detection work once the internal walls have gone. Because 98% of Soho homes are flats, the same drawing can go to the freeholder and managing agent as the basis of the licence to alter.
The end of the job needs the same care. Westminster issues a completion certificate only once all fees due have been received and all relevant electrical and gas certificates have been supplied. An open-plan Soho flat can gain relocated lighting, new sockets in what was a wall, a moved cooker circuit and upgraded fire detection, each certified by the registered electrician. Where a gas hob or boiler moves, a gas certificate follows too. We keep a list of every certificate the job will produce from the first week and tick them off as each trade tests.
Consents and finish in W1
Because Soho's buildings share their walls with the neighbours, the wall you want opened up frequently forms part of the party wall, or the beam bearings cut into it. That makes the work notifiable under the Party Wall Act. You serve the party wall notice as building owner (or your surveyor does); we give you the drawings and programme it needs and build to any award. In a tightly built W1 street, handling this properly keeps the neighbours comfortable and stops the project being held up by an avoidable dispute.
An open-plan conversion is internal structural work, controlled under the Building Regulations rather than planning permission, so Westminster City Council's building control inspects and certifies the steelwork and fire protection. The internal work needs no planning permission, though Soho is a conservation area and any external change to a flat needs an application, and a listed building needs listed building consent for internal structural work. We run the engineer and building control together, then plaster, level and finish the new space so it feels like it was always one room, with the mess kept firmly under control.
- Beam depth checked against existing ceiling heights
- Rooflights and glazed roofs to bring light deep into the plan
- Flush beam detailing where a downstand would look wrong
VOA Council Tax stock of properties, March 2025, for the Fitzrovia West & Soho statistical area, which also covers west Fitzrovia. Counts rounded by the VOA.
The GS Renovation Difference in Soho
For open-plan conversions in Soho, GS Renovation gives you one accountable team from first survey to final finish. We arrange the structural engineer, book and meet Westminster building control, and carry out the propping, steelwork and building work ourselves; any party wall notice is yours to serve, with the drawings we supply. You get a correctly supported opening, a clean, connected W1 space and a result signed off by building control, backed by our founder's 30+ years of structural experience.
George always kept to commitments and arrived on time. He offered helpful suggestions during his initial visit and promptly provided a reasonably…
Saaid is the best craftsman I have worked with. He knows what he is doing from the very beginning. He has a great knowledge of construction…
It's the second time I have hired George and he has been absolutely professional and the work he did resembles perfectly what I had in mind. Being an…
FAQ
Frequently Asked Questions about Open-Plan Conversions Soho
Are there hidden costs with open-plan conversion in Soho?
Every extra cost on open-plan conversion in Soho needs your written agreement, and the foreseeable ones are already priced within £3,000 to £8,000 or more (indicative). Work in Victorian or Edwardian housing around W1 occasionally reveals something behind plaster; when it does, GS Renovation stops, costs it and waits for your decision. The sequence of work stays fixed: the heating is resized before the space is decorated.
Does open plan suit a small Soho upper floor?
It frequently does, because the floor plates are shallow and every partition costs light. Removing internal walls in your Soho flat lets daylight from the front reach further back, and in a small plan that matters more than separate rooms do. What is lost is the ability to close off noise and cooking. Retaining one enclosed room is often the better compromise.
How does street noise affect an open plan Soho flat?
It reaches the whole flat once the internal walls have gone. Your Soho building sits in an area that stays busy late, and a single open volume gives noise entering at the windows nothing to stop it. Improving the glazing, adding soft finishes and keeping one room enclosed as a bedroom all help. That is worth planning before the walls come out rather than afterwards.
Is an escape route needed in an open plan Soho flat?
Yes, and removing the hall is exactly what raises the question. Where a Soho flat becomes one space, there is no protected hallway between the living area and the entrance door, so detection throughout, the performance of the entrance door and the route through the rest of the building all matter. The strategy is agreed with building control before the layout is fixed.
Where does cooking extraction go in a small Soho flat?
To an outlet the building permits, decided before the kitchen is positioned. In an open plan Soho flat cooking smells and moisture reach every corner, so ducted extraction to outside is worth considerably more than a recirculating hood. Whether a new penetration through the elevation is permitted depends on the building and the freeholder. That answer usually decides where the kitchen goes.
What limits the layout of a small Soho flat?
The position of the drainage and the entrance door more than the walls. In a Soho flat the waste connection is fixed where the building's stack runs, so the kitchen has to stay within reach of it unless a new route can be agreed. The door opens into what becomes the living space once partitions go, which affects both privacy and the escape arrangement.
When should kitchen units be ordered for an open-plan Soho flat?
After the full plans approval. Westminster building control aims to contact applicants within 5 weeks with a decision and says it may take longer. In a small Soho flat the plan checker may ask for a door or screen to be kept for escape, and that changes where units and worktops can go, so the kitchen is measured and ordered against the approved layout.
Can Westminster's own building control service handle an open-plan Soho scheme?
Yes. Westminster City Council runs its own building control service, the District Surveyors Building Control Service, and accepts full plans, building notice and regularisation applications online. A registered building control approver is the alternative. For a Soho flat above a business, choosing early means the fire separation questions go to one body from the start instead of being answered twice.
Is taking out a stud partition in a Soho flat notifiable if it carries nothing?
It can be. A partition that carries no load may still enclose the protected hall between the living rooms and the front door, and removing it alters the means of escape, which is building regulations work. Westminster excludes layout changes from the building notice route, so the change goes as full plans. With 98% of Soho homes being flats, this is worth checking before any stud wall comes out.
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